[MULTIVARIABLE CALCULUS] (10 points) if z = f(x, y) has a continuous second partial derivative and x = s^2 + t^2, y = 3st, find ∂z^2/∂s∂t

Asap i need it now choose all the answers that apply. sex-linked disorders affect males more than females affect females more than males can be carried by females, without being expressed are always expressed in males are caused by genes carried on the x and y chromosomes

Which of the binomials below is a factor of this exression? 16x^2+40xy+25y^2 a.4x-5y b. 2x-5y c.4x+5y d.2x+5y

The function models the number of accidents